Yarn-tension device



J. o. M KEAN YARN TENSIQN DEVICE Filed Oct. 21, 1921 Patented July it), i923.

Ul llTE STT' JOHN O. MGKEAN, OF WESTFIELD, MASSACHUSETTS, ASSIGNOR TO FOSTER MACHINE COMPANY, OF WESTFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

YARN-TENSION DEVICE.

Application filed October 21, 1921. Serial No. 509,250.

T 0 all whom it may concern:

Be it known that 1, JOHN O. MOKEAN, a citizen of the United States, and resident of Westfield, in the county of Hampden and State of Massachusetts, have invented a new and useful Improvement in Yarn-Tens on Devices, of which the following is a specification.

In stop motions, in connection with whlch a tension device is used which includes a loosely mounted gravity operated tension disk, the disk has, so far as known, been made of castiron or machine steel, thus presenting a hard metal yarn contact surface. Therefore. when the stop motion operates, the dropping of the arm on which the tension device is mounted causes a sharp hammer blow of the hard metal yarn contact surface of the disk on the yarn located between the disk and its support, frequently cutting the yarn in two.

The object of my invention is to prevent this cutting action of the disk, by providing a disk having a soft or malleable metal surface contacting with the yarn, either by providing a built-up tension disk having an insert of soft or malleable metal, such as lead for example; or by providing an integral disk composed of a soft or malleable metal.

Practical embodiments of my invention are represented in the accompanying drawings, in which Fig. 1 illustrates, in side elevation, the portion of a stop motion which carries the tension device, including my improved gravity operated loosely mounted tension disk, the parts being shown in dotted lines in their normal running position, and in full lines in their knocked off or stopped position.

1 ig. 2 in top Fig.

Fig. tion.

Fig. 5 illustrates the same in vertical central section.

Fig. 6 illustrates another form of tension disk in side elevation.

Fig. 7 illustrates the same in vertical central section.

The tension device includes the yarn supillustrates one form of tension disk lan.

3 illustrates the same in bottom plan. 4: illustrates the same in side elevaport 1 carried by the swinging arm 2 of the stop motion, from which support 1 uprises a pin 3, as is usual. Loosely mounted on the pin 3 is a gravity operated tension disk which normally rests upon the yarn support 1. The yarn, indicated by 4, passes between the support 1 and the gravity op erated tension disk.

In the built-up form of tension disk, illustrated in Figs. 1 to 5 inclusive, a soft or malleable metal insert 5 is permanently secured to the face of a lateral flange 6 extending from a hollow sleeve 7. This is preferably accomplished by spinning the edge 8 of the flange 6 into the periphery of the insert 5. This insert is provided with a central hole 9in alinement with the bore of the sleeve 7. r

In the integral form of tension disk, illustrated in Figs. 6 and 7 the disk 10 is composed of soft or malleable metal, and it is provided with a centrally arranged hole 11 for loosely mounting the disk on the pin 3.

The soft or malleable metal which I have found suitable is lead. By providing a soft or malleable metal yarn contact surface for the tension disk, I have found that no amount of hammering blow, due to the op eration of the stop motion, is sufficient to cut the yarn, thus rendering the tension disk particularly well adapted for use in connection with yarn tension devices which are mounted on stop motions where the tension devices are subjected to violent movements due to the operation of the stop motion.

It is evident that various changes may be made in the construction, form and material of the tension disks without departing from the spirit and scope of my invention; hence I do not wish to limit myself to the particular embodiments illustrated but What I claim is:

1. A tension disk having a yarn contact surface of a metal having substantially the softness of lead.

2. A tension disk tact surface.

8. A tension disk of a metal having substantially the softness of lead.

4. A lead tension disk.

5. In a tension device, a suitable support, a vertically disposed pin, and a gravity operated tension disk loosely mounted on the having a lead yarn conpin, said disk'having a yarn contact surface of a'metal having substantially the softness of lead.

6. In a tension device, a suitable support, a vertically disposed pin, and a gravity operated tension" disk loose-1y mounted on the pin, said disk having'a lead yarn contact surface.

7. In a tension disk, a suitable support, a vertically disposed pin, and a gravity operated tension disk of a metal having subed on the p n.

8; In a tension disk, a suitable support,

a vertically disposed pin, and a gravity 0perated lead tension disk mounted on the'pin. In testimony that I claim the" foregoing as my, invention, I have signed my name this 13th day of October, 1921.

' JOHN O. McKEAN. 

